After receiving the quest, bring the questgiver to the town where the betrothed is being held. Then ask for directions to the residence where the betrothed is and kill any guards inside. Take them to the specified temple in the specified town and kill the thugs inside. Speak to the priest to begin the wedding, and collect your reward from the questgiver.

[Questgiver] of [Questgiver's town] asked me to escort him to [Specified town] to find [Betrothed]. [Questgiver] is betrothed to [Betrothed] but [Kidnapper] wants to kill [Betrothed] to prevent the marriage. They are to be wed at [Temple] in [Temple's town].